<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <script>
        var str = "lsp";
        var i = 1314;
        var PI = 3.1415926;
        console.log(str,i,PI);
        console.log(typeof str);

        var str2 = 'lsp';
        var i2 = 1314;
        var PI2 = 3.1415926;
        console.log(str2,i2,PI2);
        console.log("str2的数据类型==》"+typeof str2);
    </script>
</body>
</html>